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Articles

STUDY ON THE CHARACTERISTICS OF THE VACUUM COOLING FOR AGRICULTURAL PRODUCTS

Article number
682_217
Pages
1625 – 1632
Language
English
Abstract
In order to design an efficient vacuum cooling system, a study was carried out using a pilot size vacuum cooling system to examine how cooling characteristics change by manipulating the vacuum and other factors.
Test results revealed that the evaporation index of moisture affects initial cooling speed until the pressure in the chamber is controlled evenly at the fresh point.
It also revealed that if the pressure in the chamber was consistent, the quality and weight of leafy vegetables were maintained almost uniformly.
In addition, if the specific surface area of the object was large, cooling speed was rapid.
However, when the final pressure and the temperature of leafy vegetables became stable, weight tends to decrease.
The ratio of the temperature lowering and the amount of weight loss during this period of time brings a decrease of cooling time.
It is believed that evaporation of moisture due to radiant heat around the surface of the object during cooling caused weight loss.
Thus, the final pressure reached in the vacuum chamber is an important parameter to determine the final temperature of the product being cooled.

Publication
Authors
W.O. Lee, H.S. Yun, K.H. Lee, H. Jeong, H.D. Lee, K.H. Cho
Keywords
Brassica campestris L., Lactuca sativa Linn., Pleurotus ostreature, vacuum cooling, cold chain system, fresh fruit and vegetables, low temperature
Full text
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